Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual bolha tem um cancelável de sim e um atributo de onpointerdown?
 ###Tabelas: CREATE TABLE rank_by_number_of_wins (rank_by_number_of_wins_id AUTO_INCREMENT PRIMARY KEY, City & Nation VARCHAR, First Place INT, Second Place INT, Third Place INT, Total Top 3 Placements INT, First Place Winning Year(s) (if applicable) VARCHAR) CREATE TABLE women's_doubles_111 (women's_doubles_111_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Tournament Name VARCHAR, Location VARCHAR, Partner VARCHAR, Score in Final VARCHAR) CREATE TABLE wins_15 (wins_15_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Tournament VARCHAR, Surface VARCHAR, Opponent in Final VARCHAR, Score in Final VARCHAR) CREATE TABLE pointer_events (pointer_events_id AUTO_INCREMENT PRIMARY KEY, Category VARCHAR, Type VARCHAR, Attribute VARCHAR, Bubbles VARCHAR, Cancelable VARCHAR) CREATE TABLE works_numbers (works_numbers_id AUTO_INCREMENT PRIMARY KEY, GE-DL works no. INT, Year built VARCHAR, Built for VARCHAR, Original no. VARCHAR, New owner VARCHAR, New no. VARCHAR)  
SELECT Bubbles FROM pointer_events WHERE Cancelable = yes AND Attribute = onpointerdown